How should siRNA/RNAi/duplex RNA oligonucleotides be stored?
RNA duplexes are significantly more resistant to nucleases than a single strand RNA oligonucleotide. However, maintaining sterile, RNAse free conditions is always recommended as a precaution. Dried pellets are stable at room temperature for 2–4 weeks, but should be placed at –20 °C or –80 °C for long term storage. Under these conditions, dry RNA is stable for at least one year. If you want to store your RNA in solution re-suspend the delivered pellet in an RNAse-free solution buffered at pH 7.4 – 7.6 and store at –20 °C or less. We recommend that RNAs are re-suspended at a convenient stock concentration and stored in small aliquots to avoid multiple freeze thaw cycles.